Taking the Nano100B for example, the clock source supported by each chip is defined in the ”system_Nano100Series.h” file. The default external crystal is 12 MHz. If an external crystal used by a user is changed to 8 MHz, the relative constant definition must be modified accordingly. Please refer to the following modification in bold:

Before the modification:

…

/*-----------------------------------------------------------

Define SYSCLK

*---------------------------------------------------------*/

#define __HXT (12000000UL)

#define __LXT (32768UL)

#define __HIRC12M (12000000UL)

#define __LIRC (10000UL)

#define __HIRC __HIRC12M

#define __HSI (__HIRC12M) /* Factory Default is internal 12MHz */

…

=============================================================

After the modification:

…

/*-----------------------------------------------------------

Define SYSCLK

*---------------------------------------------------------*/

#define __HXT (8000000UL)

#define __LXT (32768UL)

#define __HIRC12M (12000000UL)

#define __LIRC (10000UL)

#define __HIRC __HIRC12M

#define __HSI (__HIRC12M) /* Factory Default is internal 12MHz */

…

Products:	Microcontrollers ,Arm Cortex-M0 MCUs ,Arm Cortex-M4 MCUs
Applications:
Function:	Peripherals,Clock Control,HXT,Software and Tools,Development-Environment,BSP Software Library

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How to modify the setting value of external crystal (HXT) for the NuMicro® series chips during programming? Issue Date：2016-05-17

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